The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 130
-Subparagraph d
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_ImpairmentLoss
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Impairment Test - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Impairment test [line items]
Estimated future cash flows pretax discount rate	11.40%	11.90%
Monitoring sensoring and radars CGU [member]
Impairment test [line items]
Impairment losses		$ 8.7
Legacy 650 [member]
Impairment test [line items]
Impairment losses		$ 50.5
Lineage [member]
Impairment test [line items]
Impairment losses	$ 61.3
Lineage [member] \| Intangible assets [member]
Impairment test [line items]
Impairment losses	58.5
Lineage [member] \| Property, plant and equipment [member]
Impairment test [line items]
Impairment losses	$ 2.8